Gun rights advocacy groups filed a lawsuit claiming that Maine's new 72-hour waiting period for firearms purchases is unconstitutional and seeking an injunction stopping its enforcement pending the outcome of the case.

Gun rights groups filed a lawsuit Tuesday that seeks to overturn the 72-hour waiting period law that Maine lawmakers passed after last year's mass shooting.

A coalition of gun rights groups is suing Maine over a law requiring a three-day waiting period to buy a firearm, arguing that the new requirements violate the Constitution. The lawsuit, filed in U.S.